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Among the best-known sauropods, Diplodocus were very large, long-necked,quadrupedal animals, with long, whip-like tails. Their fore limbs were slightly shorter than their hind limbs, resulting in a largely horizontal posture. The skeletal structure of these long-necked, long-tailed animals supported by four sturdy legs have been compared with suspension bridges. In fact, Diplodocus carnegii is currently one of the longest dinosaurs known from a complete skeleton, with a total length of 25 metres (82 ft). Modern mass estimates for Diplodocus carnegii have tended to be in the 10– to 16-tonne) range.